<template lang="html">
  <div class="goods">
    <div class="menu-wrapper" ref="menuWrapper">
      <ul>
        <li v-for="(item,index) in goods" class="menu-item" :class="{'current':currentIndex === index}" @click="selectMenu(index, $event)">
          <span class="text">
            <span v-show="item.type>0" class="icon" :class="classMap[item.type]"></span>{{item.name}}
          </span>
        </li>
      </ul>
    </div>
    <div class="foods-wrapper" ref="foodWrapper">
      <ul>
        <li v-for="item in goods" class="food-list food-list-hook">
          <h1 class="title">{{item.name}}</h1>
          <ul>
            <li v-for="food in item.foods" class="food-item" @click="selectFood(food,$event)">
              <div class="icon">
                <img :src="food.icon" alt="">
              </div>
              <div class="content">
                <h2 class="name">{{food.name}}</h2>
                <p class="desc">{{food.description}}</p>
                <div class="extra">
                  <span class="count">月售{{food.sellCount}}份</span>
                  <span>好评率{{food.rating}}%</span>
                </div>
                <div class="price">
                  <span class="now">￥{{food.price}}</span>
                  <span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
                </div>
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </div>
            </li>
          </ul>
        </li>
      </ul>
    </div>
    <shopcart :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
    <food :food="selectedFood" ref="food"></food>
  </div>

</template>

<script>
import BScroll from 'better-scroll'
import shopcart from '../shopcart/shopcart'
import cartcontrol from '../cartcontrol/cartcontrol'
import food from '../food/food'

export default {

  props:{
    seller:{
      type:Object
    }
  },
  data(){
    return {
      goods: [],
      listHeight: [],
      scrollY: 0,
      classMap: ['decrease','discount','guarantee','invoice','special'],
      selectedFood:{}
    }
  },
  computed:{
    currentIndex() {
      for(let i = 0;i<this.listHeight.length;i++){
        let height1 = this.listHeight[i];
        let height2 = this.listHeight[i+1];
        if(!height2 || (this.scrollY >= height1 && this.scrollY < height2) ){
          return i;
        }
      }
      return 0;
    },
    selectFoods(){
      let foods = [];
      this.goods.forEach((good) => {
        good.foods.forEach((food) => {
          if (food.count) {
            foods.push(food);
          }
        })
      });
      return foods;
    }
  },
  created(){
    //this.classMap = ['decrease','discount','guarantee','invoice','special'];

    this.$http.get('/api/goods').then((res) => {
      res = res.body;
      if (res.errno === 0) {
        this.goods = res.data;
        //console.log(this.goods);
        this.$nextTick(() => {
          this._initScroll();
          this.calculateHeight();
        });

      }
    });

  },
  methods: {
    selectMenu(index,event) {

      console.log(event._constructed);
      if(!event._constructed){
        
        return;
      }
      console.log(index);
      let foodList = this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
      let el = foodList[index];
      this.foodsScroll.scrollToElement(el,300);
    },
    _initScroll() {
      this.menuScroll = new BScroll(this.$refs.menuWrapper, {
        click:true
      });

      this.foodsScroll = new BScroll(this.$refs.foodWrapper, {
        probeType: 3,
        click:true
      });

      this.foodsScroll.on('scroll',(pos) => {
        this.scrollY = Math.abs(Math.round(pos.y));
      });
    },
    calculateHeight() {
      let foodList = this.$refs.foodWrapper.getElementsByClassName('food-list-hook');
      let height = 0;
      this.listHeight.push(height);
      for(let i = 0; i<foodList.length;i++){
        let item = foodList[i];
        height += item.clientHeight;
        this.listHeight.push(height);
      }

    },
    selectFood(food,event){
      if(!event._constructed){

        return;
      }
      this.selectedFood = food;
      this.$refs.food.show()
    }
  },
  components: {
    shopcart,
    cartcontrol,
    food
  }
}
</script>

<style lang="less">
  .goods{
    display: flex;
    position: absolute;
    width: 100%;
    top:174px;
    bottom: 46px;
    overflow: hidden;
    .menu-wrapper{
      flex: 0 0 80px;
      width: 80px;
      background-color: #f3f5f7;
      .menu-item{
        display: table;
        height: 54px;
        width: 56px;
        line-height: 14px;
        padding: 0 12px;
        &.current{
          position: relative;
          margin-top: -1px;
          z-index: 10;
          background-color: #fff;
          font-weight: 700;
          .text{
            border: none;
          }
        }
        .icon{
          display: inline-block;
          width: 12px;
          height: 12px;
          margin-right: 2px;
          background-size: 12px 12px;
          background-repeat: no-repeat;
          vertical-align: middle;
          &.decrease{
            background-image: url("decrease_3@2x.png");
          }
          &.discount{
            background-image: url("discount_3@2x.png");
          }
          &.guarantee{
            background-image: url("guarantee_3@2x.png");
          }
          &.invoice{
            background-image: url("invoice_3@2x.png");
          }
          &.special{
            background-image: url("special_3@2x.png");
          }
        }
        .text{
          display: table-cell;
          font-size: 12px;
          width: 56px;
          vertical-align: middle;
          border-bottom: 1px solid rgba(7, 17, 27, 0.2);

        }
      }
    }
    .foods-wrapper{
      flex: 1;
      .title{
        padding-left: 14px;
        height: 26px;
        line-height: 26px;
        border-left: 2px solid #d9dde1;
        font-size: 12px;
        color: rgb(147,153,159);
        background-color: #f3f5f7;
      }
      .food-item{
        display: flex;
        margin: 18px;
        padding-bottom: 18px;
        border-bottom: 1px solid rgba(7, 17, 27, 0.1);
        &:last-child{
          border: 0;
          margin-bottom: 0;
        }
        .icon{
          flex: 0 0 57px;
          margin-right: 10px;
          img{
            width: 100%;
          }
        }
        .content{
          flex: 1;
          position: relative;
          .name{
            margin: 2px 0 8px 0;
            height: 14px;
            line-height: 14px;
            font-size: 14px;
            color: rgb(7, 17, 27);
          }
          .desc{
            margin-bottom: 8px;
            line-height: 12px;
            font-size: 10px;
            color: rgb(147,153,159);
          }
          .extra{
            line-height: 10px;
            font-size: 10px;
            color: rgb(147,153,159);
            .count{
              margin-right: 12px;
            }
          }
          .price{
            font-weight: 700;
            line-height: 24px;
            .now{
              margin-right: 8px;
              font-size: 14px;
              color: rgb(240,20,20);
            }
            .old{
              text-decoration: line-through;
              font-size: 10px;
              color: rgb(147, 153, 159);
            }
          }
          .cartcontrol-wrapper{
            position: absolute;
            right: 0;
            bottom: 12px;
          }
        }
      }
    }
  }
</style>
